Compositional kinetics for the lower cretaceous Eumeralla formation, Otway Group, Otway Basin, Australia : data release / B. Horsfield, C. J. Boreham, D. S. Edwards, R. di Primio, V. Tiem, N. Mahlstedt.

By: Horsfield, B [author.]
Contributor(s): Boreham, C. J. (Christopher John) [author.] | Edwards, D. S. (Dianne Saint) [author.] | Di Primio, R [author.] | Tiem, V [author.] | Mahlstedt, N [author.] | Geoscience Australia Minerals, Energy and Groundwater Division [issuing body.]
Material type: TextTextSeries: Geoscience Australia record: 2021/039Publisher: Canberra, ACT : Geoscience Australia 2022Copyright date: ©2021Description: 1 online resource (iii, 25 pages) : illustrations, 2.1 tables, 3.9b figuresContent type: text Media type: computer Carrier type: online resourceISBN: 9781922446886 (PDF)Subject(s): Geological modeling | Chemical kinetics | Organic geochemistry | Petroleum -- Prospecting -- Australia | Otway Basin (Australia)Online Resources: Online Record | Geoscience Australia website
List(s) this item appears in: New Titles March 2022
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Includes bibliographic references (page 21).

1. Introduction -- 2. Samples and methods -- 2.1 Kerogen isolation -- 2.2 Kinetics determination -- 2.3 Pyrolysis-gas chromatography -- 2.4 Microscale sealed vessel (MSSV) pyrolysis -- 3. Results -- 3.1 petroleum type organofacies -- 3.2 Bulk kinetics -- 3.3 MSSV pyrolysis results and generation of compositional kinetics -- 4. References -- 5. Appendix 1. Methodology and background information on the compositional and phase kinetics approach Sample information and datasets -- 6. Appendix 2. Sample information and datasets 7. Appendix 3. PetroMod files for cumulative and instantaneous kinetics.

Geoscience Australia currently uses two commercial petroleum system modelling software packages, PetroMod and Zetaware, to undertake burial and thermal history modelling on wells in Australian sedimentary basins. From the integration of geological (age-based sedimentary packages, uplift and erosional events), petrophysical (porosity, permeability, and thermal conductivity) and thermal (downhole temperature, heat flow, vitrinite reflectance, and Tmax) input data, to name the most significant, a best-fit model of the time-temperature history is generated. Since the transformation of sedimentary organic matter (kerogen) into petroleum (oil and gas) is a chemical reaction, it is governed by chemical kinetics i.e. time and temperature (in the geological setting, pressure is of secondary importance). Thus, the use of chemical kinetics associated with a formation-specific, immature potential source rock (where available) from the basin of interest is considered a better practical approach rather than relying on software kinetic defaults, which are generally based on the chemical kinetics determined experimentally on Northern Hemisphere organic matter types. As part of the Offshore Energy Systems program hydrocarbons from the Lower Cretaceous Eumeralla Formation were selected where available from onshore wells; compositional kinetics (1-, 2-, 4- and 14-component (phase) kinetics) were undertaken by GeoS4, Germany. The phase kinetics approach is outlined in Appendix 1. This report provides the compositional kinetics for potential source rocks from the Lower Cretaceous Otway Group, Otway Basin, Australia. The kinetic data were used in the offshore petroleum system modelling reported in Schenk et al. (2021)--Online abstract.

Horsfield, B., Boreham, C.J., Edwards, D.S., di Primo, R., Tiem, V., Mahlstedt, N. 2022. Compositional Kinetics for the Lower Cretaceous Eumeralla Formation, Otway Group, Otway Basin, Australia. GA RECORD 2021/039. Geoscience Australia, Canberra. http://

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